AttributeError：'_Screen'對象沒有屬性'mainloop'

Question

我正在設計一個簡單的Python程序，使用Turtle圖形模塊在屏幕上用箭頭鍵畫線。

import turtle 

turtle.setup(400,500)    # Determine the window size 
wn = turtle.Screen()     # Get a reference to the window 
wn.title("Handling keypresses!")  # Change the window title 
wn.bgcolor("lightgreen")    # Set the background color 
tess = turtle.Turtle()    # Create our favorite turtle 

# The next four functions are our "event handlers". 
def h1(): 
    tess.forward(30) 

def h2(): 
    tess.left(45) 

def h3(): 
    tess.right(45) 

def h4(): 
    wn.bye()      # Close down the turtle window 

# These lines "wire up" keypresses to the handlers we've defined. 
wn.onkey(h1, "Up") 
wn.onkey(h2, "Left") 
wn.onkey(h3, "Right") 
wn.onkey(h4, "q") 

# Now we need to tell the window to start listening for events, 
# If any of the keys that we're monitoring is pressed, its 
# handler will be called. 
wn.listen() 
wn.mainloop() 

當我嘗試執行它時，返回以下錯誤。

Traceback (most recent call last): 
    File "C:\Users\Noah Huber-Feely\Desktop\PEN_Programming\Python\etchy_sketch1.py", line 32, in <module> 
    wn.mainloop() 
AttributeError: '_Screen' object has no attribute 'mainloop' 

我使用的是Python 2.7，並沒有遇到過Turtle圖形的麻煩。直到現在，我纔開始着手處理這個問題已經發生的關鍵輸入。

在網上搜索，我只找到有關不同問題和模塊的文章，而不是我目前遇到的文章。

讓我知道你是否需要更多信息。謝謝！

Answer 1

它仍然是turtle.mainloop()，而不是wn.mainloop()。

我懷疑是因爲你可以製作多個屏幕，所以仍然有turtle模塊管理所有屏幕，而不是嘗試使多個主環路一起工作是有意義的。